Hi, maybe you didnt use your sim card for a long time so you can call to the customer care they will find a solution for this or you can go directly the nearest cutomer service they will provide a new sim cardwas this helpfull

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Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
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click here to download the app (for users in the US for now) and get all the help you need.goodluck!

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Try other company sim-cards......if they work....then try other docomo sim...if this works ur sim is faulty........get a new sim.......if ur set reads other co sim and not docomo....its ur sets fault.......u will have to change FEM(N2700 in pic.) ic...(as it has inbuilt duplex er i.e. antina switch which can cause this fault)... this ic can be obtained from a dead Nk2700....

There is another way to confirm this without dismantling ur set........switch on ur set with sim....ignore sim reg fail message.....go to menu>settings>phone settings>network>change this to manual >ok......now ur phone should search for network.....if it does not then either ur sim has fault or sim section......if it starts searching then let it search......after some time network service provider list will appear....on the top it should be tata docomo......if its not there then FEM ic to be replaced.....if it appears select it......if now sim registeration fail appears ....for ur and other tata docomo sim...then get software of ur set reloaded......if only ur docomo sim fails...get sim replaced